Casing elevator



' Apr. 10, 1923.

1,451,199 F. M. BLAIR CASING ELEVATOR Filed Mar. 50, 1922 Patented Apr.10, 1923.

UNiTEfi STATES 1,451,1aa ATENT QFFECE.

FRANK M. BLAIR, 0F NEWARK, OHIO, ASSIGNOR TO THE CREE-BECKER O IL TOOLCOMPANY, OF NEWARK, OHIO.

CASING ELEVATOR.

Application filed March 30, 1922. Serial No. 548,058.

To all 207mm it may concern Be it known that I, FRAEK M. BLAIR, acitizen of the United States, residiin at Nev-:ark, in the county ofLicking and gtate of Ohio, have invented a new and useful CasingElevator, of which the following is a specification.

This invention relates to casing elevators designed for raising andlowering casings and tubings of oil, gas, artesian and other wells; q

As is well known to those skilled in the art the links constitute theweakest part of easing elevators, lVhen a link has broken, heretofore,it has not been practical to have the same repaired in the field becauseit is impossible for a blacksmith or anyone not having the necessaryequipment, to reproduce the exact compound curvature necessary in linksof this character in order to allow the elevator to'properly shift thecasing without bending, straining or breaking it when the casing or tubeto which the elevator is applied is raised or lowered. Because of thisfact it has been necessary, in many instances, to substitute an entirelynew elevator when one of the links has become broken or, in lieuthereof, to ship the entire elevator to the factory to have a new linksupplied.

One of the objects of the present invention is to so connect the linksto the elevator that new ones can be easily substituted in the fieldwithout requiring the. services of a skilled mechanic and withoutrequiring the use of special fastening means for holding the links inplace, thereby enabling the user to avoid the objections resulting fromefforts to repair or replace parts in the field and also to eliminatethe expense necessary in order to ship entire elevators to and from afactory for repair.

With the foregoing and other objects in View which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that, within the scope ofwhat is claimed, changes in the precise embodiment of the inventionshown can be made without departing from the spirit of the invention.

In the accompanying drawings the preferred form of the invention hasbeen shown.

In said drawings- Figure 1 is a side elevation of an elevator having thepresent improvements combined therewith.

Figure 2 is an elevation of the elevator and showing, in full lines, oneof the links while being inserted into engagement with the elevator and,in dotted lines, the posit1on of the link after being assembled with theelevator.

Referring to the figures by characters of reference 1 designates anelevator of the usual two part construction, or someother type thmembers of the elevatorb'eing hingedly connected at one end, asindicated at 2 and being detachably connected at their other end by alatch 3 as shown or in any other manner desired. Lugs 4 are provided atthe hinge and latchends or in other types somewhere in the ear of one ofthe members, each of these lugs being provided with a slot 5 extendingupwardly thereinto from the lower end of the lug and opening into acircular opening 6.

A pair of links are used in connection with th elevator, the two linksbeing duplicates and oppositely disposed as shown in Figure 1. Eachlink, which has been indicated at 7, has parallel cylindrical portions 8passing at one end into an end portion 9 which is also circular in crosssection while the other ends of the portions 8 gradually diverge towardthe other end of the link, as shown at 10, the said link being graduallyreduced in thickness from the portions 8 to the end 11 of the link andthe width of said end being greater than that of the remainder of thelink. The link is also bowed or curved from the portions 8 to tlie end11 as shown particularly in Figure The two links are so proportionedthat when they are in their normal positions relative to the elevatorthe end portions 9 thereof will fit within the openings 6 as shown inFigure 1 while the portions 10 of the links will converge upwardlytoward each other and contact as shown at 12. Thus the links can beengaged as ordinarily and the elevator raised and lowered for thepurpose of raising or lowering a well casing or tube and-as the openings6 are arranged ordinary elevators of this character and should one ofthe links become broken the same can be easily removed and anothersubstituted. This substitution is effected by placing a link 7 below theelevator in a po sition the reverse of that illustrated in Figure 1. Theflattened end 11 of the link is inserted upwardly into the slot 5 andopening 6 and the link is then slid longitudinally until said endportion 11 passes out of the opening as shown for example by full linesin Figure 2 and one of the portions 10, and, subsequently, one of theportions 8 come into the opening 6 after which the end portion 9 arriveswithin the opening. The link after being thus brought to position withthe end 9 inthe opening 6 and the balance of the link hanging downwardlytherefrom, is swung upwardly through 180 until it comes to its raisedposition as shown by full lines in Figure 1 whereupon the parts will beheld properly assembled and cannot be separated except by breaking themor by reversing the movement of the link hereinbefore described.

Obviously by providing a structure such as described it becomesunnecessary to employ any special fastening means for holding the linksdetachably in place. Furthermore a new link can easily be placed inposition without requiring the services of a skilled mechanic.

What is claimed is:

1. The combination with an elevator having oppositely extending lugs,there being transverse openings in the lower portions of the lugs andslots extending upwardly to.

said openings from the lower ends of the lugs, of links of variablethickness removably seated in the openings.

2. The combination with an elevator having oppositely extending lugs,there being an opening in each lug and a slot extending to said openingfrom the lower end of the lug, of a pair of links detachably seatedwithin the openings, each of said links having its lower end portionnormally seated in one of the openings and of greater diameter than theslot leading to the opening.

3. The combination with an elevator having oppositely extending lugs,there being a transverse opening in each lug and a slot extending toeach opening from the lower end of the lug, of oppositely disposed linksremovably mounted within the respective,

openings, each of said links having its lower end normally seated in oneof the openings and of a diameter greater than the width of the slotleading to said opening, each link having a portion thereof of athickness less than the width of the slot.

In testimony that I claim the foregoing as my own, I have hereto aflixedmy signature 1n the presence of two witnesses.

FRANK M. BLAIR. Witnesses

